springboot mybatis使用xml方式配置方式

项目地址：github地址

• 创建项目
• 配置pom.xml
• mybatis配置
• main函数创建 application.yml文件创建
• 单元测试

1.创建一个maven项目

文件目录格式：

创建

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.hiro</groupId>
    <artifactId>springbootDemo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>1.3.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.41</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

如果对应依赖在当前工程还是不能正确引用，右击pom.xml-》Maven-》Reimport

mybatis引入

mybatis可通过注解和xml引入，这里主要介绍xml配置。
创建UserMapper.java

package com.hiro.demo.db.dao;

import com.hiro.demo.db.entity.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

/**
 * Project: springbootDemo
 *
 * @author : hirolin
 * @date : 2019/3/25 22:14
 */
@Mapper
public interface UserMapper {

    User getUser(@Param("id") int id);
}

创建User.java

package com.hiro.demo.db.entity;

/**
 * Project: springbootDemo
 *
 * @author : hirolin
 * @date : 2019/3/25 22:14
 */
public class User {

    private int id;

    private String name;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

创建xml文件：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.hiro.demo.db.dao.UserMapper">

    <resultMap type="com.hiro.demo.db.entity.User" id="userMap">
        <id column="id" property="id" />
        <result column="name" property="name" jdbcType="VARCHAR"/>
    </resultMap>

    <select id="getUser" resultMap="userMap">
        select * from user where id = #{id}
    </select>

</mapper>

main函数创建 application.yml文件创建

package com.hiro.demo;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;

/**
 * Project: springbootDemo
 *
 * @author : hirolin
 * @date : 2019/3/25 22:13
 */
@SpringBootApplication
@MapperScan("com.hiro.demo.db")
public class DemoApplication {
    public static void main(String [] args) {
        SpringApplication.run(DemoApplication.class,args);
    }
}

application.yml

spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/demo
    username: root
    password: xxxxx #自己的数据库配置
    driver-class-name: com.mysql.jdbc.Driver
mybatis:
  mapper-locations: classpath:mapper/*xml

单元测试

package com.hiro.demo;

import com.hiro.demo.db.dao.UserMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * Project: springbootDemo
 *
 * @author : hirolin
 * @date : 2019/3/25 22:15
 */
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = DemoApplication.class)
public class DemoApplicationTest {

    @Autowired
    private UserMapper userMapper;

    @Test
    public void Test(){
        System.out.printf(userMapper.getUser(1).getName());
    }

}

完整目录结构：

在这里插入图片描述